Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/7250#discussion_r34231514
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -577,6 +575,10 @@ class StreamingContext private[streaming] (
* @throws IllegalStateException if the StreamingContext is already
stopped.
*/
def start(): Unit = synchronized {
+ // Registering Streaming Metrics at the start of the StreamingContext
+ assert(env != null)
--- End diff --
This assert can be eliminated.
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